SerialPort::Handshake Property

 

Gets or sets the handshaking protocol for serial port transmission of data using a value from Handshake.

Namespace:   System.IO.Ports
Assembly:  System (in System.dll)

public:
[BrowsableAttribute(true)]
property Handshake Handshake {
	Handshake get();
	void set(Handshake value);
}

Property Value

Type: System.IO.Ports::Handshake

One of the Handshake values. The default is None.

Exception Condition
IOException

The port is in an invalid state.

- or -

An attempt to set the state of the underlying port failed. For example, the parameters passed from this SerialPort object were invalid.

ArgumentOutOfRangeException

The value passed is not a valid value in the Handshake enumeration.

When handshaking is used, the device connected to the SerialPort object is instructed to stop sending data when there is at least (ReadBufferSize-1024) bytes in the buffer. The device is instructed to start sending data again when there are 1024 or fewer bytes in the buffer. If the device is sending data in blocks that are larger than 1024 bytes, this may cause the buffer to overflow.

If the Handshake property is set to RequestToSendXOnXOff and CtsHolding is set to false, the XOff character will not be sent. If CtsHolding is then set to true, more data must be sent before the XOff character will be sent.

The following code example demonstrates the use of the SerialPort class to allow two users to chat from two separate computers connected by a null modem cable. In this example, the users are prompted for the port settings and a username before chatting. This code example is part of a larger code example provided for the SerialPort class.

public:
    static void Main()
    {
        String^ name;
        String^ message;
        StringComparer^ stringComparer = StringComparer::OrdinalIgnoreCase;
        Thread^ readThread = gcnew Thread(gcnew ThreadStart(PortChat::Read));

        // Create a new SerialPort object with default settings.
        _serialPort = gcnew SerialPort();

        // Allow the user to set the appropriate properties.
        _serialPort->PortName = SetPortName(_serialPort->PortName);
        _serialPort->BaudRate = SetPortBaudRate(_serialPort->BaudRate);
        _serialPort->Parity = SetPortParity(_serialPort->Parity);
        _serialPort->DataBits = SetPortDataBits(_serialPort->DataBits);
        _serialPort->StopBits = SetPortStopBits(_serialPort->StopBits);
        _serialPort->Handshake = SetPortHandshake(_serialPort->Handshake);

        // Set the read/write timeouts
        _serialPort->ReadTimeout = 500;
        _serialPort->WriteTimeout = 500;

        _serialPort->Open();
        _continue = true;
        readThread->Start();

        Console::Write("Name: ");
        name = Console::ReadLine();

        Console::WriteLine("Type QUIT to exit");

        while (_continue)
        {
            message = Console::ReadLine();

            if (stringComparer->Equals("quit", message))
            {
                _continue = false;
            }
            else
            {
                _serialPort->WriteLine(
                    String::Format("<{0}>: {1}", name, message) );
            }
        }

        readThread->Join();
        _serialPort->Close();
    }

    static void Read()
    {
        while (_continue)
        {
            try
            {
                String^ message = _serialPort->ReadLine();
                Console::WriteLine(message);
            }
            catch (TimeoutException ^) { }
        }
    }

.NET Framework
Available since 2.0
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